4 ms·
The 65C816 had full backwards compatibility with the 6502 and starts in emulation mode after a reset making it essentially identical to the 6502 until switched
by grawprog 7y ago
The 65C816 had full backwards compatibility with the 6502 and starts in emulation mode after a reset making it essentially identical to the 6502 until switched to native mode. Even in native.mode it retains a lot of backwards compatibility with the 6502.
https://en.m.wikipedia.org/wiki/WDC_65C816 https://en.m.wikipedia.org/wiki/WDC_65C816
- PaulHoule 7y agoThat is a nice chip. It has the same 24-bit address space as the early IBM 360 mainframes, the 80286 and a handful of other systems. It's much less cramped than the 16-bit environment of the 6502, the PDP-11, etc. It's easy to underestimate the 6052 because other chips (the 68k) series are better on paper. However, interrupt handling is fast and DMA efficient so it is a good match to the family computer role. Apple thought that the Apple ][ would be rapidly out of date so it rushed ahead with the failed Apple ///, the Lisa, Macintosh, etc. They did not realize the ][ was going to last as long as it did, otherwise they would have prioritized the Apple 2gs -- rather than the Mac which had two near-death experiences before the company became the leader in mobile.